Showing 2007Show all

244 papers · 1 filter

astro-ph2007★ 233 cited

The Complete Census of 70-um-Bright Debris Disks within the FEPS (Formation and Evolution of Planetary Systems) Spitzer Legacy Survey of Sun-like Stars

Lynne A. Hillenbrand, John M. Carpenter, Jinyoung Serena Kim +7

(abbreviated) We report detection with the Spitzer Space Telescope of cool dust surrounding solar type stars. The observations were performed as part of the Legacy Science Program,…

astro-ph2007★ 5 cited

Dissecting the star-formation history of starburst galaxies: the case of NGC7673

A. Pasquali, P. Castangia

We have collected archival data on NGC7673 to constrain the star-formation history that produced the young star clusters and the field stellar population in this galaxy during the…

astro-ph2007★ 57 cited

Interferometric detections of GOODS 850-5 at 1 mm and 1.4 GHz

H. Dannerbauer, F. Walter, G. Morrison

We have obtained a position (at sub-arcsecond accuracy) of the submillimeter bright source GOODS 850-5 (also known as GN10) in the GOODS North field using the IRAM Plateau de Bure…

astro-ph2007★ 12 cited

Mid-infrared imaging of brown dwarfs in binary systems

K. Geißler, G. Chauvin, M. F. Sterzik

Context: Brown dwarfs exhibit complex atmospheric signatures, and their properties depend sensitively on effective temperature, surface gravity, and metallicity. Several physical p…

astro-ph2007★ 44 cited

SHARC-II 350 micron Observations of Thermal Emission from Warm Dust in z>=5 Quasars

Ran Wang, Jeff Wagg, Chris L. Carilli +10

We present observations of four z>= SDSS quasars at 350 micron with the SHARC-II bolometer camera on the Caltech Submillimeter Observatory. These are among the deepest observations…

astro-ph2007★ 186 cited

The Population of Dark Matter Subhaloes: Mass Functions and Average Mass Loss Rates

Carlo Giocoli, Giuseppe Tormen, Frank C. van den Bosch

Using a cosmological N-Body simulation and a sample of re-simulated cluster-like haloes, we study the mass loss rates of dark matter subhaloes, and interpret the mass function of s…

astro-ph2007★ 108 cited

Discovery of a bipolar X-ray jet from the T Tauri star DG Tau

M. Guedel, S. L. Skinner, M. Audard +2

We have obtained and analyzed Chandra ACIS-S observations of the strongly accreting classical T Tauri star DG Tau. Our principal goals are to map the immediate environment of the s…

astro-ph2007★ 7 cited

Ground-based variability surveys towards Centaurus A: worthwhile or not?

Jelte T. A. de Jong, Konrad H. Kuijken, Philippe Heraudeau

Context: Difference imaging has proven to be a powerful technique for detecting and monitoring the variability of unresolved stellar sources in M 31. Using this technique in survey…

astro-ph2007★ 109 cited

Evolution of Mid-IR Excess Around Sun-like Stars: Constraints on Models of Terrestrial Planet Formation

M. R. Meyer, J. M. Carpenter, E. E. Mamajek +11

We report observations from the Spitzer Space Telescope (SST) regarding the frequency of 24 micron excess emission toward sun-like stars. Our unbiased sample is comprised of 309 st…

astro-ph2007★ 29 cited

Gaia: Organisation and challenges for the data processing

F. Mignard, C. Bailer-Jones, U. Bastian +9

Gaia is an ambitious space astrometry mission of ESA with a main objective to map the sky in astrometry and photometry down to a magnitude 20 by the end of the next decade. While t…

astro-ph2007★ 68 cited

The T Tauri star RY Tau as a case study of the inner regions of circumstellar dust disks

A. A. Schegerer, S. Wolf, Th. Ratzka +1

We study the inner region of the circumstellar disk around the TTauri star RY Tau. Our aim is to find a physical description satisfying the available interferometric data, obtained…

astro-ph2007★ 37 cited

Kinematics of a hot massive accretion disk candidate

H. Beuther, A. Walsh

Characterizing rotation, infall and accretion disks around high-mass protostars is an important topic in massive star formation research. With the Australia Telescope Compact Array…

astro-ph2007★ 137 cited

Million-Degree Plasma Pervading the Extended Orion Nebula

M. Guedel, K. R. Briggs, T. Montmerle +3

Most stars form as members of large associations within dense, very cold (10-100 K) molecular clouds. The nearby giant molecular cloud in Orion hosts several thousand stars of ages…

astro-ph2007

An infrared view of (candidate accretion) disks around massive young stars

A. Bik, A. Lenorzer, W-. F. Thi +4

Near-infrared surveys of high-mass star-forming regions start to shed light onto their stellar content. A particular class of objects found in these regions, the so-called massive…

astro-ph2007★ 26 cited

Go Long, Go Deep: Finding Optical Jet Breaks for Swift-Era GRBs with the LBT

X. Dai, P. M. Garnavich, J. L. Prieto +20

Using the 8.4m Large Binocular Telescope, we observed six GRB afterglows from 2.8 hours to 30.8 days after the burst triggers to systematically probe the late time behaviors of aft…

astro-ph2007★ 13 cited

Warm Molecular Gas in M51: Mapping the Excitation Temperature and Mass of H_2 with the Spitzer Infrared Spectrograph

G. Brunner, K. Sheth, L. Armus +7

We have mapped the warm molecular gas traced by the H_2 S(0) - H_2 S(5) pure rotational mid-infrared emission lines over a radial strip across the nucleus and disk of M51 (NGC 5194…

astro-ph2007★ 216 cited

Vigorous star formation with low efficiency in massive disk galaxies at z=1.5

E. Daddi, H. Dannerbauer, D. Elbaz +4

We present the first detection of molecular gas cooling CO emission lines from ordinary massive galaxies at z=1.5. Two sources were observed with the IRAM Plateau de Bure Interfero…

astro-ph2007★ 10 cited

A Deep Catalog of Variable Stars in a 0.66deg^2 Lupus Field

David T. F. Weldrake, Daniel D. R. Bayliss

We have conducted a wide-field photometric survey in a single 52'x52' field towards the Lupus Galactic Plane in an effort to detect transiting Hot Jupiter planets. The planet Lupus…

astro-ph2007★ 4 cited

Primordial Mass Segregation in Starburst Stellar Clusters

Sami Dib, Mohsen Shadmehri, Maheswar Gopinathan +2

We present a model to explain the mass segregation and shallow mass functions observed in the central parts of dense and young starburst stellar clusters. The model assumes that th…

astro-ph2007★ 2 cited

A method for exploiting domain information in astrophysical parameter estimation

C. A. L. Bailer-Jones

I outline a method for estimating astrophysical parameters (APs) from multidimensional data. It is a supervised method based on matching observed data (e.g. a spectrum) to a grid o…

astro-ph2007★ 13 cited

Correlated spectral variability in brown dwarfs

C. A. L. Bailer-Jones

Models of brown dwarf atmospheres suggest they exhibit complex physical behaviour. Observations have shown that they are indeed dynamic, displaying small photometric variations ove…

astro-ph2007★ 94 cited

IMAGES I. Strong evolution of galaxy kinematics since z=1

Y. Yang, H. Flores, F. Hammer +20

(abbreviated) We present the first results of the ESO large program, ``IMAGES'' which aims at obtaining robust measurements of the kinematics of distant galaxies using the multi-IF…

astro-ph2007★ 1 cited

Accretion and Outflow-Related X-Rays in T Tauri Stars

M. Guedel, K. Briggs, K. Arzner +22

We report on accretion- and outflow-related X-rays from T Tauri stars, based on results from the "XMM-Newton Extended Survey of the Taurus Molecular Cloud." X-rays potentially form…

astro-ph2007★ 95 cited

Mid-Infrared Spectroscopy of Lensed Galaxies at 1<z<3: The Nature of Sources Near the MIPS Confusion Limit

J. R. Rigby, D. Marcillac, E. Egami +10

We present Spitzer/IRS mid-infrared spectra for 15 gravitationally lensed, 24 micron--selected galaxies, and combine the results with 4 additional very faint galaxies with IRS spec…